20105432 has 8 divisors (see below), whose sum is σ = 37697700. Its totient is φ = 10052712.

The previous prime is 20105419. The next prime is 20105443. The reversal of 20105432 is 23450102.

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 20105432.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1256582 + ... + 1256597.

Almost surely, 2^20105432 is an apocalyptic number.

It is an amenable number.

20105432 is a deficient number, since it is larger than the sum of its proper divisors (17592268).

20105432 is a wasteful number, since it uses less digits than its factorization.

20105432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2513185 (or 2513181 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 20105432 is about 4483.9081168106. The cubic root of 20105432 is about 271.9179034243.

Adding to 20105432 its reverse (23450102), we get a palindrome (43555534).

The spelling of 20105432 in words is "twenty million, one hundred five thousand, four hundred thirty-two".